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ShaderPlayground / deps / imgui / imgui / examples / example_sdl3_sdlgpu3 / main.cpp

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1	// Dear ImGui: standalone example application for SDL3 + SDL_GPU
2	// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
3
4	// Learn about Dear ImGui:
5	// - FAQ https://dearimgui.com/faq
6	// - Getting Started https://dearimgui.com/getting-started
7	// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
8	// - Introduction, links and more at the top of imgui.cpp
9
10	// Important note to the reader who wish to integrate imgui_impl_sdlgpu3.cpp/.h in their own engine/app.
11	// - Unlike other backends, the user must call the function ImGui_ImplSDLGPU_PrepareDrawData() BEFORE issuing a SDL_GPURenderPass containing ImGui_ImplSDLGPU_RenderDrawData.
12	// Calling the function is MANDATORY, otherwise the ImGui will not upload neither the vertex nor the index buffer for the GPU. See imgui_impl_sdlgpu3.cpp for more info.
13
14	#include "imgui.h"
15	#include "imgui_impl_sdl3.h"
16	#include "imgui_impl_sdlgpu3.h"
17	#include <stdio.h> // printf, fprintf
18	#include <stdlib.h> // abort
19	#include <SDL3/SDL.h>
20
21	// This example doesn't compile with Emscripten yet! Awaiting SDL3 support.
22	#ifdef __EMSCRIPTEN__
23	#include "../libs/emscripten/emscripten_mainloop_stub.h"
24	#endif
25
26	// Main code
27	int main(int, char**)
28	{
29	// Setup SDL
30	// [If using SDL_MAIN_USE_CALLBACKS: all code below until the main loop starts would likely be your SDL_AppInit() function]
31	if (!SDL_Init(SDL_INIT_VIDEO \| SDL_INIT_GAMEPAD))
32	{
33	printf("Error: SDL_Init(): %s\n", SDL_GetError());
34	return 1;
35	}
36
37	// Create SDL window graphics context
38	float main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
39	SDL_WindowFlags window_flags = SDL_WINDOW_RESIZABLE \| SDL_WINDOW_HIDDEN \| SDL_WINDOW_HIGH_PIXEL_DENSITY;
40	SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+SDL_GPU example", (int)(1280 * main_scale), (int)(800 * main_scale), window_flags);
41	if (window == nullptr)
42	{
43	printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
44	return 1;
45	}
46	SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
47	SDL_ShowWindow(window);
48
49	// Create GPU Device
50	SDL_GPUDevice* gpu_device = SDL_CreateGPUDevice(SDL_GPU_SHADERFORMAT_SPIRV \| SDL_GPU_SHADERFORMAT_DXIL \| SDL_GPU_SHADERFORMAT_MSL \| SDL_GPU_SHADERFORMAT_METALLIB, true, nullptr);
51	if (gpu_device == nullptr)
52	{
53	printf("Error: SDL_CreateGPUDevice(): %s\n", SDL_GetError());
54	return 1;
55	}
56
57	// Claim window for GPU Device
58	if (!SDL_ClaimWindowForGPUDevice(gpu_device, window))
59	{
60	printf("Error: SDL_ClaimWindowForGPUDevice(): %s\n", SDL_GetError());
61	return 1;
62	}
63	SDL_SetGPUSwapchainParameters(gpu_device, window, SDL_GPU_SWAPCHAINCOMPOSITION_SDR, SDL_GPU_PRESENTMODE_VSYNC);
64
65	// Setup Dear ImGui context
66	IMGUI_CHECKVERSION();
67	ImGui::CreateContext();
68	ImGuiIO& io = ImGui::GetIO(); (void)io;
69	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
70	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
71	io.ConfigFlags \|= ImGuiConfigFlags_DockingEnable; // Enable Docking
72	io.ConfigFlags \|= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows
73
74	// Setup Dear ImGui style
75	ImGui::StyleColorsDark();
76	//ImGui::StyleColorsLight();
77
78	// Setup scaling
79	ImGuiStyle& style = ImGui::GetStyle();
80	style.ScaleAllSizes(main_scale); // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
81	style.FontScaleDpi = main_scale; // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
82	io.ConfigDpiScaleFonts = true; // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
83	io.ConfigDpiScaleViewports = true; // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
84
85	// When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
86	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
87	{
88	style.WindowRounding = 0.0f;
89	style.Colors[ImGuiCol_WindowBg].w = 1.0f;
90	}
91
92	// Setup Platform/Renderer backends
93	ImGui_ImplSDL3_InitForSDLGPU(window);
94	ImGui_ImplSDLGPU3_InitInfo init_info = {};
95	init_info.Device = gpu_device;
96	init_info.ColorTargetFormat = SDL_GetGPUSwapchainTextureFormat(gpu_device, window);
97	init_info.MSAASamples = SDL_GPU_SAMPLECOUNT_1; // Only used in multi-viewports mode.
98	init_info.SwapchainComposition = SDL_GPU_SWAPCHAINCOMPOSITION_SDR; // Only used in multi-viewports mode.
99	init_info.PresentMode = SDL_GPU_PRESENTMODE_VSYNC;
100	ImGui_ImplSDLGPU3_Init(&init_info);
101
102	// Load Fonts
103	// - If fonts are not explicitly loaded, Dear ImGui will select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
104	// This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
105	// - You can load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
106	// - If a file cannot be loaded, AddFont functions will return a nullptr. Please handle those errors in your code (e.g. use an assertion, display an error and quit).
107	// - Read 'docs/FONTS.md' for more instructions and details.
108	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use FreeType for higher quality font rendering.
109	// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
110	//style.FontSizeBase = 20.0f;
111	//io.Fonts->AddFontDefaultVector();
112	//io.Fonts->AddFontDefaultBitmap();
113	//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf");
114	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
115	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
116	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
117	//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf");
118	//IM_ASSERT(font != nullptr);
119
120	// Our state
121	bool show_demo_window = true;
122	bool show_another_window = false;
123	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
124
125	// Main loop
126	bool done = false;
127	while (!done)
128	{
129	// Poll and handle events (inputs, window resize, etc.)
130	// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
131	// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
132	// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
133	// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
134	// [If using SDL_MAIN_USE_CALLBACKS: call ImGui_ImplSDL3_ProcessEvent() from your SDL_AppEvent() function]
135	SDL_Event event;
136	while (SDL_PollEvent(&event))
137	{
138	ImGui_ImplSDL3_ProcessEvent(&event);
139	if (event.type == SDL_EVENT_QUIT)
140	done = true;
141	if (event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED && event.window.windowID == SDL_GetWindowID(window))
142	done = true;
143	}
144
145	// [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppIterate() function]
146	if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
147	{
148	SDL_Delay(10);
149	continue;
150	}
151
152	// Start the Dear ImGui frame
153	ImGui_ImplSDLGPU3_NewFrame();
154	ImGui_ImplSDL3_NewFrame();
155	ImGui::NewFrame();
156
157	// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
158	if (show_demo_window)
159	ImGui::ShowDemoWindow(&show_demo_window);
160
161	// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
162	{
163	static float f = 0.0f;
164	static int counter = 0;
165
166	ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
167
168	ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
169	ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
170	ImGui::Checkbox("Another Window", &show_another_window);
171
172	ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
173	ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
174
175	if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
176	counter++;
177	ImGui::SameLine();
178	ImGui::Text("counter = %d", counter);
179
180	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
181	ImGui::End();
182	}
183
184	// 3. Show another simple window.
185	if (show_another_window)
186	{
187	ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
188	ImGui::Text("Hello from another window!");
189	if (ImGui::Button("Close Me"))
190	show_another_window = false;
191	ImGui::End();
192	}
193
194	// Rendering
195	ImGui::Render();
196	ImDrawData* draw_data = ImGui::GetDrawData();
197	const bool is_minimized = (draw_data->DisplaySize.x <= 0.0f \|\| draw_data->DisplaySize.y <= 0.0f);
198
199	SDL_GPUCommandBuffer* command_buffer = SDL_AcquireGPUCommandBuffer(gpu_device); // Acquire a GPU command buffer
200
201	SDL_GPUTexture* swapchain_texture;
202	SDL_WaitAndAcquireGPUSwapchainTexture(command_buffer, window, &swapchain_texture, nullptr, nullptr); // Acquire a swapchain texture
203
204	if (swapchain_texture != nullptr && !is_minimized)
205	{
206	// This is mandatory: call ImGui_ImplSDLGPU3_PrepareDrawData() to upload the vertex/index buffer!
207	ImGui_ImplSDLGPU3_PrepareDrawData(draw_data, command_buffer);
208
209	// Setup and start a render pass
210	SDL_GPUColorTargetInfo target_info = {};
211	target_info.texture = swapchain_texture;
212	target_info.clear_color = SDL_FColor { clear_color.x, clear_color.y, clear_color.z, clear_color.w };
213	target_info.load_op = SDL_GPU_LOADOP_CLEAR;
214	target_info.store_op = SDL_GPU_STOREOP_STORE;
215	target_info.mip_level = 0;
216	target_info.layer_or_depth_plane = 0;
217	target_info.cycle = false;
218	SDL_GPURenderPass* render_pass = SDL_BeginGPURenderPass(command_buffer, &target_info, 1, nullptr);
219
220	// Render ImGui
221	ImGui_ImplSDLGPU3_RenderDrawData(draw_data, command_buffer, render_pass);
222
223	SDL_EndGPURenderPass(render_pass);
224	}
225
226	// Update and Render additional Platform Windows
227	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
228	{
229	ImGui::UpdatePlatformWindows();
230	ImGui::RenderPlatformWindowsDefault();
231	}
232
233	// Submit the command buffer
234	SDL_SubmitGPUCommandBuffer(command_buffer);
235	}
236
237	// Cleanup
238	// [If using SDL_MAIN_USE_CALLBACKS: all code below would likely be your SDL_AppQuit() function]
239	SDL_WaitForGPUIdle(gpu_device);
240	ImGui_ImplSDL3_Shutdown();
241	ImGui_ImplSDLGPU3_Shutdown();
242	ImGui::DestroyContext();
243
244	SDL_ReleaseWindowFromGPUDevice(gpu_device, window);
245	SDL_DestroyGPUDevice(gpu_device);
246	SDL_DestroyWindow(window);
247	SDL_Quit();
248
249	return 0;
250	}